新增数据库翻页查询
This commit is contained in:
feiyangqingyun
487
dbpage/dbpage.cpp
Normal file
487
dbpage/dbpage.cpp
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@@ -0,0 +1,487 @@
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#include "dbpage.h"
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SqlQueryModel::SqlQueryModel(QObject *parent) : QSqlQueryModel(parent)
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{
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allCenter = false;
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alignCenterColumn.clear();
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alignRightColumn.clear();
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}
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QVariant SqlQueryModel::data(const QModelIndex &index, int role) const
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{
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QVariant value = QSqlQueryModel::data(index, role);
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if (allCenter) {
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if(role == Qt::TextAlignmentRole ) {
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value = Qt::AlignCenter;
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}
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} else {
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//逐个从列索引中查找是否当前列在其中
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int column = index.column();
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bool existCenter = alignCenterColumn.contains(column);
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bool existRight = alignRightColumn.contains(column);
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if(role == Qt::TextAlignmentRole) {
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if (existCenter) {
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value = Qt::AlignCenter;
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}
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if (existRight) {
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value = (QVariant)(Qt::AlignVCenter | Qt::AlignRight);
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}
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}
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}
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return value;
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}
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void SqlQueryModel::setAllCenter(bool allCenter)
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{
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this->allCenter = allCenter;
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}
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void SqlQueryModel::setAlignCenterColumn(const QList<int> &alignCenterColumn)
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{
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this->alignCenterColumn = alignCenterColumn;
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}
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void SqlQueryModel::setAlignRightColumn(const QList<int> &alignRightColumn)
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{
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this->alignRightColumn = alignRightColumn;
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}
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DbCountThread::DbCountThread(QObject *parent) : QThread(parent)
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{
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connName = "qt_sql_default_connection";
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sql = "select 1";
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connect(this, SIGNAL(finished()), this, SLOT(deleteLater()));
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}
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void DbCountThread::run()
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{
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//计算用时
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QDateTime dtStart = QDateTime::currentDateTime();
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QSqlQuery query(QSqlDatabase::database(connName));
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query.exec(sql);
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query.next();
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int count = query.value(0).toUInt();
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QDateTime dtEnd = QDateTime::currentDateTime();
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double msec = dtStart.msecsTo(dtEnd);
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emit receiveCount(count, msec);
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}
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void DbCountThread::setConnName(const QString &connName)
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{
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this->connName = connName;
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}
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void DbCountThread::setSql(const QString &sql)
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{
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this->sql = sql;
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}
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QScopedPointer<DbPage> DbPage::self;
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DbPage *DbPage::Instance()
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{
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if (self.isNull()) {
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QMutex mutex;
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QMutexLocker locker(&mutex);
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if (self.isNull()) {
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self.reset(new DbPage);
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}
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}
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return self.data();
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}
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DbPage::DbPage(QObject *parent) : QObject(parent)
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{
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startIndex = 0;
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tempSql = "";
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sql = "";
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queryModel = new SqlQueryModel;
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pageCurrent = 1;
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pageCount = 0;
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resultCount = 0;
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resultCurrent = 0;
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labPageCount = 0;
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labPageCurrent = 0;
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labResultCount = 0;
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labResultCurrent = 0;
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labResult = 0;
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labInfo = 0;
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tableView = 0;
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btnFirst = 0;
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btnPre = 0;
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btnNext = 0;
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btnLast = 0;
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countName = "*";
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connName = "qt_sql_default_connection";
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dbType = DbType_Sqlite;
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pageCurrent = 0;
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pageCount = 0;
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resultCount = 0;
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resultCurrent = 30;
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tableName = "";
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selectColumn = "*";
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orderSql = "";
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whereSql = "";
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columnNames.clear();
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columnWidths.clear();
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insertColumnIndex = -1;
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insertColumnName = "";
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insertColumnWidth = 50;
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}
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void DbPage::bindData(const QString &columnName, const QString &orderColumn, const QString &tableName,
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QComboBox *cbox, const QString &connName)
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{
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QSqlQuery query(QSqlDatabase::database(connName));
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query.exec("select " + columnName + " from " + tableName + " order by " + orderColumn + " asc");
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while (query.next()) {
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cbox->addItem(query.value(0).toString());
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}
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}
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void DbPage::bindData(const QString &columnName, const QString &orderColumn, const QString &tableName,
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QList<QComboBox *> cboxs, const QString &connName)
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{
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QSqlQuery query(QSqlDatabase::database(connName));
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query.exec("select " + columnName + " from " + tableName + " order by " + orderColumn + " asc");
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while (query.next()) {
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foreach (QComboBox *cbox, cboxs) {
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cbox->addItem(query.value(0).toString());
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}
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}
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}
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void DbPage::bindData(const QString &sql)
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{
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queryModel->setQuery(sql, QSqlDatabase::database(connName));
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tableView->setModel(queryModel);
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//依次设置列标题列宽
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int columnCount = tableView->model()->columnCount();
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int nameCount = columnNames.count();
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columnCount = columnCount > nameCount ? nameCount : columnCount;
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QList<QString> columnNames = this->columnNames;
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QList<int> columnWidths = this->columnWidths;
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//根据设置添加新列,将对应新列的标题名称和宽度按照索引位置插
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if (insertColumnIndex >= 0) {
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columnCount++;
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columnNames.insert(insertColumnIndex, insertColumnName);
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columnWidths.insert(insertColumnIndex, insertColumnWidth);
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queryModel->insertColumn(insertColumnIndex);
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}
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//设置列标题和列宽度
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for (int i = 0; i < columnCount; i++) {
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queryModel->setHeaderData(i, Qt::Horizontal, columnNames.at(i));
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tableView->setColumnWidth(i, columnWidths.at(i));
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}
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if (labPageCurrent != 0) {
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labPageCurrent->setText(QString("第 %1 页").arg(pageCurrent));
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}
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if (labPageCount != 0) {
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labPageCount->setText(QString("共 %1 页").arg(pageCount));
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}
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if (labResultCount != 0) {
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labResultCount->setText(QString("共 %1 条").arg(resultCount));
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}
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if (labResultCurrent != 0) {
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labResultCurrent->setText(QString("每页 %1 条").arg(resultCurrent));
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}
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if (labInfo != 0) {
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labInfo->setText(QString("共 %1 条 每页 %2 条 共 %3 页 第 %4 页").arg(resultCount).arg(resultCurrent).arg(pageCount).arg(pageCurrent));
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}
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//发送结果信号
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emit receivePage(pageCurrent, pageCount, resultCount, resultCurrent);
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}
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void DbPage::slot_receiveCount(quint32 count, double msec)
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{
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if (labResult != 0) {
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labResult->setText(QString("查询用时 %1 秒").arg(QString::number(msec / 1000, 'f', 3)));
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}
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resultCount = count;
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int yushu = resultCount % resultCurrent;
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//不存在余数,说明是整行,例如300%5==0
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if (yushu == 0) {
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if (resultCount > 0 && resultCount < resultCurrent) {
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pageCount = 1;
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} else {
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pageCount = resultCount / resultCurrent;
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}
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} else {
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pageCount = (resultCount / resultCurrent) + 1;
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}
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//2014-10-9增加翻页按钮可用不可用处理,如果只有一页数据,则翻页按钮不可用
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if (pageCount <= 1) {
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btnFirst->setEnabled(false);
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btnLast->setEnabled(false);
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btnNext->setEnabled(false);
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btnPre->setEnabled(false);
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} else {
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btnFirst->setEnabled(true);
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btnLast->setEnabled(true);
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btnNext->setEnabled(true);
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btnPre->setEnabled(true);
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}
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tempSql = QString("select %1 from %2 %3 order by %4").arg(selectColumn).arg(tableName).arg(whereSql).arg(orderSql);
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sql = QString("%1 limit %2,%3;").arg(tempSql).arg(startIndex).arg(resultCurrent); //组织分页SQL语句
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bindData(sql);
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}
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void DbPage::first()
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{
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if (pageCount > 1) {
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startIndex = 0;
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pageCurrent = 1;
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sql = QString("%1 limit %2,%3;").arg(tempSql).arg(startIndex).arg(resultCurrent);
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bindData(sql);
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btnLast->setEnabled(true);
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btnNext->setEnabled(true);
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}
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btnFirst->setEnabled(false);
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btnPre->setEnabled(false);
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}
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void DbPage::previous()
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{
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if (pageCurrent > 1) {
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pageCurrent--;
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startIndex -= resultCurrent;
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sql = QString("%1 limit %2,%3;").arg(tempSql).arg(startIndex).arg(resultCurrent);
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bindData(sql);
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btnLast->setEnabled(true);
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btnNext->setEnabled(true);
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}
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if (pageCurrent == 1) {
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btnFirst->setEnabled(false);
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btnPre->setEnabled(false);
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}
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}
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void DbPage::next()
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{
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if (pageCurrent < pageCount) {
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pageCurrent++;
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startIndex += resultCurrent;
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sql = QString("%1 limit %2,%3;").arg(tempSql).arg(startIndex).arg(resultCurrent);
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bindData(sql);
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btnFirst->setEnabled(true);
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btnPre->setEnabled(true);
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}
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if (pageCurrent == pageCount) {
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btnLast->setEnabled(false);
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btnNext->setEnabled(false);
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}
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}
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void DbPage::last()
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{
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if (pageCount > 0) {
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startIndex = (pageCount - 1) * resultCurrent;
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pageCurrent = pageCount;
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sql = QString("%1 limit %2,%3;").arg(tempSql).arg(startIndex).arg(resultCurrent);
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bindData(sql);
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btnFirst->setEnabled(true);
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btnPre->setEnabled(true);
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}
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btnLast->setEnabled(false);
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btnNext->setEnabled(false);
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}
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//设置显示数据的表格控件,当前翻页信息的标签控件等
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void DbPage::setControl(QTableView *tableView,
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QLabel *labPageCount, QLabel *labPageCurrent,
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QLabel *labResultCount, QLabel *labResultCurrent,
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QLabel *labResult, QLabel *labInfo,
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QAbstractButton *btnFirst, QAbstractButton *btnPre,
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QAbstractButton *btnNext, QAbstractButton *btnLast,
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const QString &countName, const QString &connName)
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{
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this->tableView = tableView;
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this->labPageCount = labPageCount;
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this->labPageCurrent = labPageCurrent;
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this->labResultCount = labResultCount;
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this->labResultCurrent = labResultCurrent;
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this->labResult = labResult;
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this->labInfo = labInfo;
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this->btnFirst = btnFirst;
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this->btnPre = btnPre;
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this->btnNext = btnNext;
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this->btnLast = btnLast;
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this->countName = countName;
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this->connName = connName;
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this->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
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//挂载翻页按钮事件
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connect(btnFirst, SIGNAL(clicked()), this, SLOT(first()));
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connect(btnPre, SIGNAL(clicked()), this, SLOT(previous()));
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connect(btnNext, SIGNAL(clicked()), this, SLOT(next()));
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connect(btnLast, SIGNAL(clicked()), this, SLOT(last()));
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}
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void DbPage::setConnName(const QString &connName)
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{
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this->connName = connName;
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}
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void DbPage::setDbType(const DbPage::DbType &dbType)
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{
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this->dbType = dbType;
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}
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void DbPage::setTableName(const QString &tableName)
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{
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this->tableName = tableName;
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}
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void DbPage::setSelectColumn(const QString &selectColumn)
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{
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this->selectColumn = selectColumn;
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}
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void DbPage::setOrderSql(const QString &orderSql)
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{
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this->orderSql = orderSql;
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}
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void DbPage::setWhereSql(const QString &whereSql)
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{
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this->whereSql = whereSql;
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}
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void DbPage::setResultCurrent(int resultCurrent)
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{
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this->resultCurrent = resultCurrent;
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}
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void DbPage::setColumnNames(const QList<QString> &columnNames)
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{
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this->columnNames = columnNames;
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}
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void DbPage::setColumnWidths(const QList<int> &columnWidths)
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{
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this->columnWidths = columnWidths;
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}
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void DbPage::setAllCenter(bool allCenter)
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{
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queryModel->setAllCenter(allCenter);
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}
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void DbPage::setAlignCenterColumn(const QList<int> &alignCenterColumn)
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{
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queryModel->setAlignCenterColumn(alignCenterColumn);
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}
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void DbPage::setAlignRightColumn(const QList<int> &alignRightColumn)
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{
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queryModel->setAlignRightColumn(alignRightColumn);
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}
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void DbPage::setInsertColumnIndex(int insertColumnIndex)
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{
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this->insertColumnIndex = insertColumnIndex;
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}
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void DbPage::setInsertColumnName(const QString &insertColumnName)
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{
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this->insertColumnName = insertColumnName;
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}
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void DbPage::setInsertColumnWidth(int insertColumnWidth)
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{
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this->insertColumnWidth = insertColumnWidth;
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}
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void DbPage::select()
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{
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//重置开始索引
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startIndex = 0;
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pageCurrent = 1;
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//假设只有一页
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slot_receiveCount(resultCurrent, 0);
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//全部禁用按钮,文本显示正在查询...
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btnFirst->setEnabled(false);
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btnLast->setEnabled(false);
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btnNext->setEnabled(false);
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btnPre->setEnabled(false);
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QString info = "正在查询...";
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if (labInfo != 0) {
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labInfo->setText(info);
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}
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if (labPageCurrent != 0) {
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labPageCurrent->setText(info);
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}
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if (labPageCount != 0) {
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labPageCount->setText(info);
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}
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if (labResultCount != 0) {
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labResultCount->setText(info);
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}
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if (labResultCurrent != 0) {
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labResultCurrent->setText(info);
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}
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if (labResult != 0) {
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labResult->setText(info);
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}
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//开始分页绑定数据前,计算好总数据量以及行数
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tempSql = QString("select count(%1) from %2 %3").arg(countName).arg(tableName).arg(whereSql);
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//采用线程执行查询复合条件的记录行数
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DbCountThread *dbCountThread = new DbCountThread(this);
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//绑定查询结果信号槽,一旦收到结果则立即执行
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connect(dbCountThread, SIGNAL(receiveCount(quint32, double)), this, SIGNAL(receiveCount(quint32, double)));
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connect(dbCountThread, SIGNAL(receiveCount(quint32, double)), this, SLOT(slot_receiveCount(quint32, double)));
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//设置数据库连接名称和查询语句,并启动线程
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dbCountThread->setConnName(connName);
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dbCountThread->setSql(tempSql);
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dbCountThread->start();
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}
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